Gas Fireplace Pilot Light Won’t Stay Lit: Reasons and Solutions

Troubleshooting a gas fireplace can be dangerous. It can cause a heavy amount if something wrong happens. There are a few reasons for fireplace won’t stay lit. What is the main reason the gas fireplace pilot light won’t stay lit? Can you do anything about it?

One of the main reasons for this problem can be not assembling the ignition properly. In some cases, you can fix it by yourself. But I recommended not to. Professional help is always better in appliances like this.

But there is no harm in knowing what and the way is this happening. Let’s take a look at why gas fireplace troubleshoots.

What Causes A Pilot Light To Not Stay Lit?

Before I go into the reason you need to understand what pilot light is.

A pilot light is a small flame that is lit 24/7 and helps to create the bigger flame in the main burner.

Without the pilot light, you would need to manually light the fireplace with a match or something similar to this.

Here are some of them.

1. Ignition Assembly

A pilot light is a part of the ignition system of a gas fireplace. So, when it does not light one of the main causes can be the ignition system is not assembled properly. 

2. Thermocouple

When the pilot light is not lighting up the next probable reason may be your fireplace’s thermocouple is bad or worn out.

The thermocouple is a device that senses the gas flow and allows the valve to supply gas to the pilot light.

4. Pilot Tube

A blocked pilot tube can also prevent the pilot light not lighting up. For one season of use, it can be blocked for many reasons. Clearing it up may help light the pilot light.

5. Gas Supply

Many times, simple things like not having a gas supply or a little gas supply can enable the pilot light to light up.

Do not panic instantly when your pilot light is not working. Things like this can easily be fixed if you are a little bit skilled at those kinds of matters.

Other Reasons a Gas Fireplace Won’t Stay Lit

Other than the most common issues there can be some other reasons why your gas fireplace won’t stay lit. here are some of them.

Gas Pressure

Sometimes incorrect gas pressure is the reason your fireplace is not working. You can measure this gas pressure with a manometer. As it is technical work, it is recommended to call for a technician to do the job for you.

Gas Valve

The gas valve is another common reason for which the pilot light or the fireplace can create problem lighting. Make sure it is open for a smooth gas flow.

Blocked Burner

It is not any of the main causes why fireplaces do not work. But it can cause uneven flames in the fireplace and eventually you will get the worst kind of flame from the fireplace if the burners remain blocked for a long period of time.

Airflow and Venting Issue

In a fireplace, the natural rule is hot air goes up and cool air comes down. If it does not happen for any reason, you are going to face trouble with your fireplace.

Airflow and venting issues come with each other. So, make sure to check both of them altogether.

What’re The Solutions? (The Easy Fixes)

A fireplace is a technical thing to maintain. A screw misplaced means a lot and it can be extremely dangerous.

So, I suggest you take professional help as long as you can. But here are some easy fixes you can try if you have no other option left.

1. Check the Assembly

If your fireplace troubleshooting, check out the assembly of the parts of the fireplace. Especially the assembly of the ignition system.

When the assembly is not right, you are bound to face problems.

2. Clean Every Season

It is important to clean out the fireplace after the season ends or at the start of the season. When different parts of the fireplace build up dirt it eventually gets blocked. As a result, the fireplace troubleshoots.

3. Pilot Tube Unblocking

If your fireplace is not starting at the beginning of the season, there are chances that the pilot tube is blocked.

To unblock it, press the pilot button for 1-3 minutes and let the air come out of the tube.

To prevent further blocking, make sure the tube is clean.

4. Gas Supply and Pressure

The gas flow must the accurate to run the gas fireplace smoothly.

If there is any problem in the supply or the pressure is not accurate, not only your fireplace will troubleshoot, it can also be damaged in the long run.

5. Damaged Parts

Make sure all of the parts of the fireplace if working correctly. If any one of them is worn out or goes bad, no matter how small it is, the fireplace will disturb.

Frequently Asked Questions (FAQs):

How do you clean a thermocouple on a gas fireplace?

Firstly, blow out the dust with compressed air and then clean it with a ball of steel wool or a sponge.

How do I know if my thermocouple is bad on my gas fireplace?

You can check it with a voltmeter. Or the first symptom you will notice is the pilot light won’t light if the thermocouple has gone bad.

Why does my gas fireplace go out after a few minutes?

It may happen if the burner is blocked with dust or any other reason.

What’s the Difference Between a Thermocouple and a Thermopile?

The main difference between a thermocouple and a thermopile is that the thermocouple is a thermoelectric device and the thermopile is a device that converts thermal energy into electrical energy.


There is nothing more disappointing that the gas fireplace does not light on a cold night. One of the main reasons for that is when the pilot light won’t light.

Though it is not a major problem to be panicked as you can still light the fireplace with matches but the absence of convenience is not expected.

So, try to keep the fireplace updated and clean as much as possible to avoid this kind of inconvenience. 

Related Posts:

Similar Posts